249749406 has 20 divisors (see below), whose sum is σ = 559624032. Its totient is φ = 83249748.

The previous prime is 249749389. The next prime is 249749413. The reversal of 249749406 is 604947942.

249749406 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 770670 + ... + 770993.

Almost surely, 2^249749406 is an apocalyptic number.

249749406 is an abundant number, since it is smaller than the sum of its proper divisors (309874626).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

249749406 is a wasteful number, since it uses less digits than its factorization.

249749406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1541677 (or 1541668 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 45.

The square root of 249749406 is about 15803.4618359396. The cubic root of 249749406 is about 629.7499688092.

The spelling of 249749406 in words is "two hundred forty-nine million, seven hundred forty-nine thousand, four hundred six".